Hello junior orsi I use Integromat to do this exact operation. Mine is a little more complicated because I am creating member pages only for certain Membership types so I have a system to check for that and then filter to only those people. However, the thing I would recommend as it is what seems to work for me is to use the HTTP module in Integromat instead of the Memberstack update a member module to add the memberPage. 

I'll include a screenshot below. 

Hope this helps!

Thank you @ John E. Matias !! I'll try it immediately.  I'll let you. know if it worked or not.

it worked! Thank you John E. Matias