remove password expiry - Set-MSOIUser not recognized

I am the administrator for our Office365 system.  For some reason Im the only person who gets the prompt that their pasword is expiring.

I'm wanting to remove my expiry to never expires but when i try to run the command in Powershell I get the error  :-

 The term 'Set-MsolUser' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

I dont see Set-MSOLUser or GetMSOLUser as available commands when I user the get-help * command.

Anyone know what the issue is here?

Thanks

Chris