bleurgh. that issue is very actively under investigation (modulo xmas). please can you submit debug logs from Element Web referencing that issue.
Something like this happens basically every time I try to use Matrix though. Messages are not decrypting, or not being delivered, or devices can’t be authenticated for some cryptic reason. The reason I even tried to use Element Desktop is because my nheko is seemingly now incapable of sending direct messages (the recepient just gets infinite “waiting for message”).
https://photos.goldstein.lol/share/OIgowBN4Wmi4zlm8DmDP0s8jH...