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Dear All,
As the issue has intermittently happened in your environments and it may need to involve our related team to further investigate the exact root causes of the issues and help you fix it directly in your environments, I suggest you follow the steps below to contact the related team.
If you are using a personal account such as ******@outlook.com, you can access support via Contact - Microsoft Support and select Contact Support and then you should be able to select Chat with a support agent in your web browser to find a person and they may involve more resources to help you fix the issue.
If you are using a work or school account such as ******@contoso.com or ******@contoso.onmicrosoft.com, you can contact the administrator if you aren't the administrator and let him follow the steps in Get support - Microsoft 365 admin | Microsoft Learn to open a support ticket or use the phone support.
The administrator is always the first person who subscribes the Microsoft 365 business subscription or the IT administrator in your organization.
About admin roles in the Microsoft 365 admin center - Microsoft 365 admin | Microsoft Learn
How do I find my Microsoft 365 admin? - Microsoft Support
@CryptikKa, generally, you may click on the pen you added and scroll down to the bottom to delete it via Delete. If you can't delete it, it is another issue and I suggest you post a new thread on our forum for expert help.
Thanks for your understanding and have a nice day!
Sincerely
Cliff | Microsoft Community Moderator