For anyone still in this thread,
Posteo support were kind enough to give us a temp login email to test with Brave.
On my end, everything seems to work without issue:
- Initially, I got the “infinite loading wheel” displayed.
- Checking dev tools, I noticed a cross-site frame was being blocked – I changed Device Recognition in the Shields panel to
Allow allwhich resolved the issue - Further, I then changed Device recognition back to
Block 3p, site continued to work without issue. - I’m still running some tests but it seems as though I’m able to access my account without issue:
