What could be the problem with MSD with below error screenshot when one clicks +/Add

The error message indicates a permissions issue: the security role assigned to the user who clicks + / Add is missing at least one required privilege on the target Dataverse/Dynamics 365 entity.

In practice, this means:

• The user’s current security role(s) do not include the needed Create/Read/Write (or other) privilege on the specific table (entity) that the + / Add action is trying to use.
• The operation fails and shows the “Insufficient Permissions” dialog.

To resolve this, an administrator needs to:

1. Identify which entity the + / Add button is creating or linking (for example, Opportunity, Activity, custom table, etc.).
2. Open the user’s security role(s) in the Power Platform admin center or Dynamics 365 security settings.
3. Grant the appropriate privilege (typically Create, and sometimes Read and Append/Append To) on that entity at the correct access level (user, business unit, organization).
4. Save the role and have the user sign out and sign back in, then retry the + / Add action.

Once the missing privilege is added to at least one of the user’s roles, the + / Add operation should succeed.

References:

• File attachments in Copilot for finance and operations apps