Hi @Amy Jandreau ,
As you are opening an existing SSAS DB, your SSAS is in Multidimensional mode.
Generally, if you can process the same SSAS database via IMPORT Wizard, then you should be able to process the dimension.
You may try it again to see if you can reproduce the issue.
The other thing is to check your SSAS server security option , see if you have server administrator permission:
If you are not a server administrator, you may ask the server administrator to add the permission as well.
Regards,
Zoe
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.