Use Signature from Directory

Go to InsideState Directory and search your name.

Click your name.

There is a button "Copy to Clipboard" under Signature.

Always use this for your signature.

Paste your signature into Outlook (Mac)

Open the Outlook app

Click Outlook and then open 'Settings'

Click 'Signatures'

Click the '+' Button

Name your signature and paste your signature from InsideState into the box and 'Save'

Change 'New messages:' and 'Replies/forwards:' to the new signature