Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Michal Frantis,
Thanks so much for uploading the requested information to help us test from our environment.
I tested this issue from my side and I can't see the error message as yours. I can choose any options i.e.: Daily, Weekdays, Weekly, Monthly without any error message:
We would also love to help you on this issue, but this issue may require the involvement of our Colleagues from the Microsoft Support Team. The Engineers from this team have higher permission than us to access resources to check this issue from the back end. Another advantage is that they can give you a remote session (call) and collect logs from you, investigate the issue and provide relevant solution. For this matter, please if you are not admin in your company, contact your IT Admin to help you raise a Ticket to Microsoft Support following the steps given in this article: Get support - Microsoft 365 admin | Microsoft Docs. I am sure our Expert Engineers from that side will focus on your specific situation and help you about your scenario.
Thank you for your cooperation, kind understanding and patience. I hope this problem gets solved quickly! Stay safe!
With Sincerest Regards,
Edwine | Microsoft Community Moderator