fails to verify signed commits from Working Copy verified by command line git and GitHub

Summary

GitLab doesn't verify signed commits made by the iOS Git client Working Copy that uses ObjectivePGP for signing.

This despite having configured and verified the email address gpglab@algoritmer.dk and configured the PGP public key (included below) on the GitLab account.

Steps to reproduce

View commit 24b61823
Tap Unverified near the top
Notice the error message:

This commit was signed with an unverified signature.

GPG Key ID: A25980CD7A4B157B

Example Project

https://gitlab.com/palmin/gpglab

What is the current bug behavior?

GitLab does not verify the commit.

What is the expected correct behavior?

GitLab should verify the commit.

Command line Git verifies the commit as shown by the following terminal command and output:

% git log --show-signature                  
commit 24b61823939cedfa2b08b30d7805604608206007 (HEAD -> master, origin/master, origin/HEAD, github/master)
Warning: Failed to set locale category LC_NUMERIC to en_DK.
Warning: Failed to set locale category LC_TIME to en_DK.
Warning: Failed to set locale category LC_COLLATE to en_DK.
Warning: Failed to set locale category LC_MONETARY to en_DK.
Warning: Failed to set locale category LC_MESSAGES to en_DK.
gpg: Signature made Mon Mar  9 10:57:05 2020 CET
gpg:                using RSA key A25980CD7A4B157B
gpg: Good signature from "Anders Borum <gpglab@algoritmer.dk>" [ultimate]
Author: Anders Borum <gpglab@algoritmer.dk>
Date:   Mon Mar 9 10:57:05 2020 +0100

    sign from device

commit f2ddede15779f29477914397ce687a3062883410
Warning: Failed to set locale category LC_NUMERIC to en_DK.
Warning: Failed to set locale category LC_TIME to en_DK.
Warning: Failed to set locale category LC_COLLATE to en_DK.
Warning: Failed to set locale category LC_MONETARY to en_DK.
Warning: Failed to set locale category LC_MESSAGES to en_DK.
gpg: Signature made Mon Mar  9 10:51:45 2020 CET
gpg:                using RSA key 88D35AC70DAE7119419A5CACA25980CD7A4B157B
gpg:                issuer "gpglab@algoritmer.dk"
gpg: Good signature from "Anders Borum <gpglab@algoritmer.dk>" [ultimate]
Author: Anders Borum <gpglab@algoritmer.dk>
Date:   Mon Mar 9 10:51:45 2020 +0100

    Signed commit

commit c9158806696380224a211579101d15181dbd10a7
Author: Anders Borum <anders@appliedphasor.com>
Date:   Mon Mar 9 09:45:00 2020 +0000

    Initial commit

Configuring the email address gpglab@algoritmer.dk on GitHub.com and uploading the same GPG public key shows the same commit as verified. https://github.com/palmin/gpglab/commit/24b61823939cedfa2b08b30d7805604608206007

Public Key

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information