Hi Mahmood_Azmi,
Using a test account, it's been confirmed that a blocked and deleted contact can be added back to Zoom Chat. Since your question is listed under Chat, I assumed this is the concern.
If you followed the steps below and receive an error message, please share that message to give us more insight on the issue. I also wonder if it's possible the user has blocked you as a contact.
- In Zoom Chat, select Contacts
- Select the ➕ icon to add contact
- Select Invite a Zoom Contact
- Enter email address of contact and select Invite
If my reply helped guide you in the right direction or resolved the issue, don't forget to click the accept as solution button! ⤵️
Cheers!