There is no need to do this:
PS P:\> Import-Module ExchangePowerShell Import-Module : Exchange Server system variable ExchangeInstallPath missing. In Zeile:1 Zeichen:1
Make sure you have the correct Exchange roles to run that command. Exchange Admin or Recipient Admin.
That error indicates you do not:
PS C:\Users\xx.xx\PycharmProjects\usermgmtautomation> add-recipientPermission add-recipientPermission : The term 'add-recipientPermission' 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.