the error message “change to a recommended screen resolution” only pops up if actually you do not run a not supported resolution.
So if you open the Windows screen resolution, it should say the same.
So you can try to change the resolution, calibrate and then change back, that might work. However, how did you check the accuracy?
If it’s in showcase or EyeX for Windows, it can also be due to the Dpi settings, so while you’re in the windows resolution settings, click on “Make text and other items larger or smaller” then click on “Let me choose one scaling level for all my displays” and change it to 100 %.