Hello @Bruuske.
Thanks for providing a screenshot about the set up you're using. Allow me to chime in and help send your emails successfully.
You can create another profile to check if you still get the same error message. I've seen a similar case before and creating another account should do the trick.
If you still get the same error, I'd suggest contacting our phone agent using the information provided by my colleague @MaryGraceS. They can isolate this issue further using their helpful tools.
Keep me updated on how it goes. I'll be here to help if you have additional questions about sending tour invoices. Have a good one.
