Attempting to sync K9 for first time with imap server via protonmail bridge

Attempting to sync K9 for first time with imap server via protonmail bridge, getting the following error:

Any thoughts on what’s going on?

See https://github.com/k9mail/k-9/issues/4729

Please try the latest beta version. See How do I become a beta tester?

Thanks! Installed 5.7.22 from github apk. No errors on connection anymore, but also don’t see any emails listed. Folders show appropriately though.

Can you provide a debug log? See https://github.com/k9mail/k-9/wiki/LoggingErrors

Sorry to revive this thread, but I’m in exactly the same position - K9 beta (5.905), connecting to Protonmail Bridge running on my Synology. I can send email, which displays in the Sent folder, but nothing else downloads. Folders are displayed but everything is empty, and when I refresh the response is suspiciously quick. I can access PM Bridge via other clients.

Debug log from K9 (extended, though I’m not sure if it covers the relevant issue): --------- beginning of main11-27 08:01:25.928 17233 17233 V MessageList: Not d - Pastebin.com

EDIT: it seems the problem is with Bridge: Inbox fetch fails with a "search queries with NOT or OR clauses are not yet implemented" error · Issue #5507 · k9mail/k-9 · GitHub