Sorry. I interpreted “two years” ago as meaning you are well familiar with how Xert works with XATA but needed help with the new forecast option.
While some content is outdated you should find my newbie tips of value – Onboarding steps for Xert trial users and newbies - General - Xert Community Forum
Since your fitness signature is likely understated (TP too low) you are in a good position to prove that number wrong from riding this fitness test in Slope mode the next time your form is blue/fresh. Slope mode ensures you can thrash away on the sprint efforts and ride to failure on the last longer interval. Even better try to jump up and sprint for at least 5-7 secs right before you are about to fail.
TP and FTP serve the same purpose but are not derived in the same manner so they aren’t meant to be the same number. Close maybe but for some users a notable difference.
The question is how well you can train with the calculated TP. An over/under TP workout will tell you that as will an over/under LTP workout indicate how close LTP is to LT1 (by RPE respiration).
What type of XFAI program have you configured and what is the target date? (Goal, Event, Race AI)