D-ID API Error: 402, {"kind":"InsufficientCreditsError","description":"not enough credits"}

I am trying to create a video using a supplied image and a custom voice on D-ID. However, I received a message stating that I do not have enough credits, even though I believe I should have sufficient credits for this process.

Could you please help clarify why this might be happening? I would appreciate any guidance on resolving this issue so I can proceed with my project.

Thank you in advance for your assistance.