"XLIST failed" when trying to connect IMAP to Zimbra OSE

Description

Trying to get email working with a Zimbra server (open source version).

Steps to Reproduce

Clear cache and config of dekko2 so that opening prompts for account setup.
autodetect will fail and prompt manual settings (OK for our dns config) configure options (ports, auth, security) that are tested to work thunderbird click next ... Server will spit out log below and throw client back to options screen.

Actual Behavior

2021-05-04 21:19:00,903 INFO  [ImapServer-169] [] imap - [127.0.0.1] connected
2021-05-04 21:19:00,904 INFO  [ImapServer-169] [ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - ID elapsed=0 (TCP)
2021-05-04 21:19:00,905 INFO  [ImapServer-169] [ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - AUTHENTICATE elapsed=1 (TCP)
2021-05-04 21:19:00,907 INFO  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - user username@domain.com authenticated, mechanism=PLAIN
2021-05-04 21:19:00,907 INFO  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - AUTHENTICATE elapsed=1 (TCP)
2021-05-04 21:19:00,952 INFO  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - ENABLE elapsed=0 (TCP)
2021-05-04 21:19:00,976 WARN  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - XLIST failed
	at com.zimbra.cs.imap.ImapPath.getReferent(ImapPath.java:489)
	at com.zimbra.cs.imap.ImapPath.useReferent(ImapPath.java:405)
	at com.zimbra.cs.imap.ImapPath.getFolder(ImapPath.java:355)
	at com.zimbra.cs.imap.ImapPath.isVisible(ImapPath.java:612)
	at com.zimbra.cs.imap.ImapHandler.accumulatePaths(ImapHandler.java:2455)
	at com.zimbra.cs.imap.ImapHandler.doLIST(ImapHandler.java:2216)
	at com.zimbra.cs.imap.ImapHandler.executeRequest(ImapHandler.java:990)
	at com.zimbra.cs.imap.TcpImapHandler.processCommand(TcpImapHandler.java:115)
2021-05-04 21:19:00,977 INFO  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - XLIST elapsed=2 (TCP)
2021-05-04 21:19:00,992 INFO  [ImapServer-169] [name=username@domain.com;ip=127.0.0.1;oip=10.7.2.212;via=10.11.11.298(nginx/1.19.0);ua=Zimbra/8.8.15_GA_4018;] imap - dropping connection for user username@domain.com (LOGOUT)

Expected Behavior

Client and server should start talking and deliverig emails Thunderbird on Ubuntu 20.04 with same connect options works.

Your Environment

• Dekko version: 0.3.3 (2021-02-15)
• Ubuntu Touch version: RC20210501, but confirmed on OTA16 and dev
• Email provider: business managed Zimbra server