Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear tornikelasuridze,
Thank you for your valuable feedback and sharing updates with us and I really appreciate your effort and your precious time doing.
Considering that all clients in your company have this issue, it may need to remotely check the environment on your side to help you find root cause.
We sincerely recommend you contact your Microsoft 365 administrator, follow steps in this article Get support - Microsoft 365 admin | Microsoft Learn, raise a support ticket from Microsoft 365 admin center to contact Microsoft Online Support.
The support team over there has higher permission than us and they can remotely help you, involve more resource to collect logs when you cannot login www.office.com and investigate the issue further to help you find root cause. This would be the most efficient way in handling this case for you.
Thanks for your understanding and cooperation. I hope that you are keeping safe and well!
Sincerely,
Tina | Microsoft Community Moderator