I received $2,500.00 in OpenAI credits from the Microsoft for Startups Founders Hub program, but when I try to use the credit to fine-tuning, I get a message Fine-tuning jobs cannot be created on an Explore plan. The old Fine-Tune that was depreciated could be used with Explore plan credits.

This might help

Answer: Feed at least the $5 minimum credit purchase into the account using the prepaid credit system when you “start payment plan”. And wait a bit for your payment to process through.