This issue is blocking production use.

Hi,

We encountered a very similar issue previously with PDF Services API. In our case, authentication, asset upload, and token generation all worked correctly, but certain operations returned:

UNSUPPORTED_OPERATION

A few things worth checking:

• Some PDF Services operations are plan-dependent and may not be enabled automatically for all projects/accounts.
• Even if the API itself is enabled, specific document operations (such as split/extract) may require entitlement activation on the Adobe backend.
• We also found that having valid OAuth scopes alone was not enough; the organization/project sometimes needed additional provisioning by Adobe.
• Another thing to verify is whether you are using the correct API version and endpoint format expected by the newer PDF Services APIs, since older examples can still circulate online.

You may also want to confirm:

• Whether your account is on trial/free tier vs paid services
• Whether the organization has accepted all service terms in Adobe Developer Console
• Whether the project is associated with the correct organization profile

If possible, try testing another advanced operation (for example combine or export) to determine whether the issue is isolated specifically to split/extract.

This definitely sounds more like an entitlement/provisioning limitation than an authentication problem since the earlier workflow stages are succeeding correctly.

Hope this helps, and interested to hear if Adobe confirms whether these endpoints now require separate activation.