i was going down trinity tower when I talked to strong at the bottom of it and took him as a follower as a mistake. The problem is my other follower was stuck in between the two side building elevators area instead of going to the settlement I told him to go.

I found him again and managed to talk to him and ordered it to got a settlement but he could not move.

I went to a settlement, dismiss the current follower I had and went back to trinity tower to get back my follower. But now he is nowhwere to be found and he is neither at the settlement I sent him to.

I heard him talking as I was going up the side building elevator but I cannot find him anywhere now and I assume he glitched through the building somewhere and none of my attempt at finding him have been successful.

welp

Funny enough, that's the exact same problem I had that I posted a topic of a couple minutes ago! Just the way the Trinity Tower is designed seems to prevent our companions from making their way back to the settlements they're sent to.

Hmm i see you had the same problem. If you can still see your follower you can try the work around I was doing, go without a follower then catch Nick over there and teleport outside.

I was also thinking of another workaround but I am not sure if it will be possible or not. In the main story sometimes your follower go in a specific place by their own and you can find them back here. Like for Nick it would be goodneighborhood. Maybe you can advance you main story to reach this point of the game and he will be teleported over there.
Sadly I lost Pipper and I have no idea if she will be saved this way.

I also wish we had access to the console to debug these stupid annoying things.