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Workflow emails containing incorrect links to forms
Issue
Emails received by internal users that are configured to use the displayUrl or editUrl tokens to insert a link to the form appear to have the form link changed from an internal link to an external link. As a result, the users receive a Form Not Found page or are prompted to enter a PIN when clicking to open a form link from within a workflow email.
Users may receive this:

Form Not Found
or this:

Authentication required (pin prompt)
Resolution
If this occurs you can insert the link to the forms using an alternative method that does not use the displayUrl or editUrl tokens. You simply specify the display or edit links in the following format:
Display URL: FullPathToList/dispform.aspx?ID={{ID}}
Edit URL: FullPathToList/editform.aspx?ID={{ID}}
Examples:
https://yourtenant.sharepoint.com/teams/site/Lists/submissions/dispform.aspx?ID={{ID}} https://yourtenant.sharepoint.com/teams/site/Lists/submissions/editform.aspx?ID={{ID}}