Updating Adobe Power Automate connector from JWT to OAuth2.0 credentials

Hi all,

I'd like to preface this post by saying I am not a developer, just someone who likes to use tools available to make work asier. I've created multiple Power Automate flows using the Acrobat API connector, and am now getting a lot of emaile about creating new credentials with OAuth2.0 or my flows will break (albeit not until Jan 2025). 

I've gotten as far as creating the OAuth credential, but not sure how to complete the migration away from the old JWT.

When I click on the OAuth Server-to-server credential, I see the following fields that I can then copy and paste into the Adobe PDF Services Power Automate connector:

My question is this: What do I put in the Base64 encoded private key? In the JWT credentials, there was an option to generate a public/private access key, that downloaded a zip file containing the private key that I could then paste in there.

I've clicked on the OAuth generate access token and entered that into the box, but got an error message. 

I should also note that I am no longer using the free version of the PDF Services API, and am paying per API call through AWS Marketplace subscription. I recently gotten the below email. I assume it must have to do with the JWT credentials they're phasing out, but seein gas how I'm getting billed through AWS, how can they no longer support it? Prob a question from AWS, but thought it might be relevant to the above issue.