Specific Mailalerts (triggers) not working today

Hello everyone

Today - like many days before - I added and edited data im my sheet and (tried to) trigger workflows. All of a sudden today mails are not delivered like they used to all days before. I changed nothing severe (only moved the sheet to a workspace, but already undone it).

It only happens within one specific workflow, other triggers still work.

I double and triple checked the workflow, I already deleted it and recreated the workflow. The support is not answering in a useful timespan. Does anyone have the same problems or - maybe someone had similar problems and has a hint for me?

I also had slight problems with login today - "Error message 51" - which asked me to re-login. Which I did several times as well.

Thanks in advance for your advice.

Kind regards

Manuel