Hi,
Since the app was upgraded from Mendix 7 to Mendix 9, I would first check the Deeplink module version.
My recommendation is to install the highest Deeplink module version that is supported for your Mendix 9 Studio Pro version. If the project still contains files from an older Deeplink module, that can cause issues after the upgrade.
Also make sure to remove the old module-related .jar files from the userlib folder before downloading and deploying again. Otherwise, the app may still use outdated dependencies.
So the safest approach is:
Update the Deeplink module to the latest version compatible with Studio Pro 9, remove the old Deeplink-related jars from userlib, then run the app again and recheck the module configuration.
This is usually the first thing to do in upgraded apps where a Marketplace module was copied over from an older Mendix version.
If this resolves your issue, please mark it as accepted.
It turned out it was a config thing in the email template
I had it on the one of the https ones so was pulling it twice as the URL already had it! So needed to be on other option.
Thanks
Jess