EOS Player Data storage

Hello,
I am currently integrating Epic Online Service (EOS) into my project, and I have encountered a challenge related to writing files to the Player Data storage.
On the server computer, the file writing process works seamlessly. However, when attempting the same operation on the client side, I encounter an issue. Specifically, the error message I receive is as follows:

EOS:[FOnlineUserCloudEOS::WriteUserFile] Unable to write file, user ‘UserUniqueNetId’ is not a local user

I have double-checked the identification of the local user on the client and confirmed that the user is logged in. Additionally, I am passing the correct UserUniqueNetId associated with the client user.

I would greatly appreciate any guidance or insights you can provide to help resolve this matter. Are there specific considerations or steps I may have overlooked in ensuring the client’s recognition as a local user during file writing operations?

Thank you for your time and assistance.

Best regards,