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Could not decrypt PGP message & Could not copy message on Ubuntu machine but works on macOS machine

Configuration files are identical on both machines since they are shared from a cloud drive.

Messages sent as a test to myself from the Ubuntu machine 'can' be decrypted and read on the macOS machine in mutt with no problems. Also, both machines sending to themselves work.

The problem is decrypting the messages on the Ubuntu machine sent from the macOS.

The Ubuntu machine has a GnugPG version which is a little older (2 years) than the macOS machine but both are above version 2.1 which saw more substantial changes from previous versions, mainly gpgme support I think.

I'm not using gpgme or its gpg-agent in the configuration files - Pure PGP config

MUTT ERROR MSG

On selecting a message in mutt's message index, I get the following:

Invoking PGP ...
Could not decrypt PGP message
Could not copy message

QUESTIONS

The GnuPG folks have said its not a PGP issue.

  1. Is this a Mutt backward compatibility issue?
  2. Can this be resolved and how?

STRACE LOG
The strace log is attached. On the Ubuntu machine, I opened mutt and 1st selected a PGP encrypted message sent from the macOS machine which fails to decrypt with the message given above.

2nd, I scroll down the message index and select a PGP encrypted message which was sent from the Ubuntu machine and 'does' decrypt correctly.

Version Details

macOS:
$ gpg --version
gpg (GnuPG) 2.3.4
libgcrypt 1.10.0
Copyright (C) 2021 Free Software Foundation, Inc.
License GNU GPL-3.0-or-later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: /Users/tonybarganski/.gnupg
Supported algorithms:
Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
        CAMELLIA128, CAMELLIA192, CAMELLIA256
AEAD: EAX, OCB
Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2

---
Mutt 2.2.1 (2022-02-19)
Copyright (C) 1996-2022 Michael R. Elkins and others.

Compile options:
-DOMAIN
+DEBUG
-HOMESPOOL  +USE_SETGID  +USE_DOTLOCK  +DL_STANDALONE  +USE_FCNTL  -USE_FLOCK
+USE_POP  +USE_IMAP  +USE_SMTP  
+USE_SSL_OPENSSL  -USE_SSL_GNUTLS  +USE_SASL  -USE_GSASL  +USE_GSS  +HAVE_GETADDRINFO
+HAVE_REGCOMP  -USE_GNU_REGEX  
+HAVE_COLOR  +HAVE_START_COLOR  +HAVE_TYPEAHEAD  +HAVE_BKGDSET
+HAVE_CURS_SET  +HAVE_META  +HAVE_RESIZETERM  +HAVE_FUTIMENS  
+CRYPT_BACKEND_CLASSIC_PGP  +CRYPT_BACKEND_CLASSIC_SMIME  +CRYPT_BACKEND_GPGME
-EXACT_ADDRESS  -SUN_ATTACHMENT  
+ENABLE_NLS  -LOCALES_HACK  +HAVE_WC_FUNCS  +HAVE_LANGINFO_CODESET  +HAVE_LANGINFO_YESEXPR
+HAVE_ICONV  -ICONV_NONTRANS  -HAVE_LIBIDN  -HAVE_LIBIDN2  +HAVE_GETSID  +USE_HCACHE  
+USE_SIDEBAR  -USE_COMPRESSED  -USE_INOTIFY  
-ISPELL

Ubuntu20.04
gpg (GnuPG) 2.2.19
libgcrypt 1.8.5
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: /home/tony/.gnupg
Supported algorithms:
Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
        CAMELLIA128, CAMELLIA192, CAMELLIA256
Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2

---
Mutt 1.13.2 (2019-12-18)
Copyright (C) 1996-2016 Michael R. Elkins and others.
Mutt comes with ABSOLUTELY NO WARRANTY; for details type `mutt -vv'.
Mutt is free software, and you are welcome to redistribute it
under certain conditions; type `mutt -vv' for details.

System: Linux 5.13.0-35-generic (x86_64)
ncurses: ncurses 6.2.20200212 (compiled with 6.2)
libidn: 1.33 (compiled with 1.33)
hcache backend: tokyocabinet 1.4.48

Compiler:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.3.0-17ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable- languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux- gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-     nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-  vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --      disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-           targets=nvptx-none=/build/gcc-9-HskZEa/gcc-9-9.3.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-     gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
Edited by Tony Barganski