There is now an elegant solution to this problem; reportedly.

Its a SaaS service (but free to use for smaller usages) that enables you to:

- Create a form for issue collection with a few clicks (select project, issuetype, initial status)
- Integrate or link to the form from webpage, email etc.
- Users enter their e-mail and fill in the form to register issues.
- When issues are updated or commented on, the user receives an update by e-mail, and can click a link to open the issue and comment (without needing access to Azure DevOps).

See information here:
Reportedly homepage