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Dear Anjali Aggarwal,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
apologized situation you encountered, we do understand the inconvenience caused and apologize for it.
- May I know if an issue is happening when you are trying to develop your own App?
If so, please be noted that this deep linking SP App related issue should falls to "developer" level. And we suggest you post your question on Microsoft 365 developer community where you may get more professional suggestions.
Microsoft 365 developer community
Thank you for your understanding. Your understanding and patience will be highly appreciated.
Have a nice day!
Best regards,