Usually the license does not affect sending mails.

Do multiple users have the same issue? When you create a new workflow for testing purposes, do you face the same problems too?

Sometimes spam filter learns stupid stuff so to make sure everything is working out good please do also check junk and clutter /focused inbox folders and see if the mail hasn't gone there.

Best regards

Enrico

Hello Enrico,

Thanks for your reply.
We created a new workflow and tested but the result remained the same.
We also know now that the license is not the problem.
During our tests we found out that when we start the workflow in a "4G/open internet" environment everything works fine.
When we start the workflow from our network than the mails our not send.
I contacted our support department but the mystery remains.

Best regards,
Jan

The problem is solved.
We had contact with Nintex support and it looks like a service problem.
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Hi Jan,
The only think which I noticed is the Microsoft incident when trying to import the workflow using the modern view of SP Online See link for more information. https://status.nintex.com/
Please let me know how it goes.
Best Regards,
Nintex Support