Client does not want to make me a member in his workspace

I want to help a client set up a project in his workspace but he does not want to make a member, and i cannot create a custom field as a guest on a table.

What are the other way to go about this to setup the project.

Ask if there’s an existing login which you can temporarily use.

Note: This is a questionable approach because it violates security protocols, but if you’re careful, change passwords before and after, and are willing to accept this, it’s a possible workaround. (I’m not recommending!)

Thanks,

Larry