@apo could log in and message but no call would start — the click produced
zero server activity. Root cause: no Synapse profiles row, which makes every
displayname write 500 in _check_profile_size (NoneType), leaves the account
without a display name, and prevents the Element Call widget iframe from
initialising. Documents diagnosis (open_id_tokens=0 is the tell), the
cross-checked INSERT fix, and who is affected. Indexed in the troubleshooting
README.
Thore Cimbal
eb5442e7bf