Agree with @JeffBrad12, it's probably just a small issue related to RPC. This network can be a bit weird at times, so be sure to try it out at certain times. BTW, I tried making a transaction on this test network just now & it went smoothly without any issues.

Try some of these RPCs:
- wss://bsc-testnet-rpc.publicnode.com
- https://api.zan.top/bsc-testnet
- https://bsc-testnet.public.blastapi.io

For a more complete list of RPC suggestions, you can head over to Chainlist & try them out one by one, DYOR.