I doubt that you will get much, if any, help from WF until all of the investigation are over and fines paid. But try everything suggested and then some.
I went through this with 2 of 3 of my dad's banks. Only one would honor it. I finally ended up getting conservatorship. When I went back to one of the banks after this process was done, they asked me why I didn't just do DPOA. I looked at that banker's face and told him that I did that but their bank wouldn't honor it. Left him speechless...............
Be aware that banks aren't the only entities that may not accept POA documents. The Social Security Administration, Medicare and the VA all require a caregiver to obtain additional authorization to access and manage an aging loved one's benefits, coverage, etc. The following article provides further information on this matter.
This article may help you understand why the bank isn't accepting your POA and how to work around it.
https://www.agingcare.com/articles/what-to-do-when-bank-rejects-poa-178641.htm
Be aware that banks aren't the only entities that may not accept POA documents. The Social Security Administration, Medicare and the VA all require a caregiver to obtain additional authorization to access and manage an aging loved one's benefits, coverage, etc. The following article provides further information on this matter.
https://www.agingcare.com/articles/make-sure-you-are-an-authorized-representative-for-your-loved-one-202376.htm
I hope this helps! Best of luck to you and your grandmother.