Not able to view calendar

Hi Expert

How to resolve the following issued show in the attachment,

I not able to view calendar show in the attachment.

How to make as a sharing calendar.
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Tom CieslikIT EngineerCommented:
Powershell script is telling you that mailbox you try to refer to doesn't exist.
Please make sure this mailbox exist and you did not misspell it

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alanlam123Author Commented:
Very strange behaviour, it exists we have been using this a communication tool for months. And I have tested no return mall errors.
Hello ThereSystem AdministratorCommented:
Tom CieslikIT EngineerCommented:
If I try to check permissions on my mailbox this command is working so it must be something with your mailbox name

Tom CieslikIT EngineerCommented:
Best solution provided, no more other questions from author
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