Hi @Cato RND ,
Thank you for contacting Q&A Forum. I would like to provide my findings and proposed solution:
Ensure that when customers create new instances of your app, import provisioning configuration by using the Microsoft Graph API to make the customized attribute synchronize consistently. Referring to https://learn.microsoft.com/en-us/entra/identity/app-provisioning/export-import-provisioning-configuration#export-and-import-your-provisioning-configuration-by-using-the-microsoft-graph-api
Kindly let me know if this work for you and please let me know if you have any further questions.
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Best regards,
Eric