Mailbox being accesses doesnot have a vaid account state(ProtocolDisabled)

[Rising Flight]

Hi

when i login to https://portal.office.com
At the right corner-click settings i can see mail
when i click mail it is redirecting to me another webpage where i can see the below error
Mailbox being accesses doesnot have a vaid account state(ProtocolDisabled)

i believe it is being blocked on firewall but i am not sure, how do i confirm this

[#2 · Accepted solution]

This most often happens when the OWA policy is disabled for the mailbox or a there is a licensing error.

If you are an administrator, follow these instructions:

1. Log in to the Exchange admin center (https://outlook.office365.com/ecp)
2. Go to recipients, find the mailbox, and double click to open it.
3. Go to mailbox features, and make sure Outlook on the web is enabled.

Also ensure that the user has a license properly assigned.

It's certainly possible that it's networking related, but I'd try those two things first.

[#3]

Similar to what Max suggested you could also check with PowerShell (if you have access) using the get-casmailbox commandlet