What might be causing my transmission to slip?

What is your question?

The transmission recently had a fluid change, the mileage on the car at that time was roughly 57,000 miles. After getting the car back from the shop, when trying to accelerate from a stop, the engine revs would climb, but the car would not move despite being in drive. I brought the car back to the shop that changed the fluid and filter. They told me the internal pressure was where it was supposed to be, also ran diagnostics and everything was up to Toyota specs. There was no fluid leaking anywhere, and nothing was wrong with the solenoid. This issue is at its worst after a cold start when vehicle has been sitting overnight. I am wondering what else it could be?

What makes this problem better or worse?

Worse after a cold start

How long has your 2017 Toyota Camry had this problem?

One week