Hi, @cddyson. Welcome to the Community, and thanks for reaching out about this. Running a test on your checkout is a really proactive step to take so that you can eliminate any unexpected issues your customers may encounter when trying to make a purchase. Let's look into it!
The first step is to double check the parameters you’ve mentioned above to ensure everything is enabled correctly, and that nothing small is being missed:
Let me know once you've double checked your test mode setup, and I'll simulate a transaction from my end to continue investigating what’s happening. (Thanks for providing your domain name, by the way!). I'll watch for your reply.