Additional Mobile Rules
For some devices which contain a hyperlink within the signature you will need to create a new rule which contains the HTML Code.
Two examples of this are the Outlook app on both iOS and Android devices.
Outlook for IOS contains a default signature of: Get Outlook for iOS
To fix this you should create a new rule with the following:
Text to Replace: 'Get <a href="https://aka.ms/o0ukef">Outlook for iOS</a>'
Rule contains HTML Code: Checked
Rule is case sensitive: unchecked
Outlook for android contains a default signature of: Get Outlook for android
Text to Replace: 'Get <a href="https://aka.ms/ghei36">Outlook for Android</a>'
Rule contains HTML Code: Checked
Rule is case sensitive: unchecked
Note: If you do not see the "Rule contains HTML Code" option you need to upgrade Email Signature Manager 8.3.0 or above.