Good morning,
I just tried it myself and I did not see any issues either as you have also noticed on the other systems logging into PayPal which means is probably isolated to the one that is just not working.
Can you tell me the system/device make, model and operating system version, are there any differences between this True Key Chrome extension with the True Key Chrome extension that is working with PayPal (eg. True Key desktop app vs. only browser extensions, versions difference, etc.)?
Finally, on the system that you are unable to log in to PayPal, can you try using an alternative browser True Key extension like Firefox or the new Edge and see if issue is now isolated to the Chrome browser/ TK Chrome extension?
Thanks,
Marc D.