Level 81, I did more than 100 maps already and no labyrinth trial yet

I've allocated all the atlas passives related to labyrinth trials and haven't spawned a single one yet. Last league I was getting a lot of trials/improved trials, and then suddenly I stopped getting improved trials for the remainder of the entire league. Back then, I must have ran more than 300 maps without getting any improved trials (I obviously had the notable allocated). I also didn't get a single opulent ritual. Don't know if it's related, but it was also very strange. But this league, not even regular trials showed up yet. And the lack of the last ascendancy points are starting to really hurt. Is it just me or are the lab trials acting weird for more people, for more time?

You farmed lab last league and you still assume you need the lab trials to run the final lab? Mhh, weird.

Also, you need at least yellow tier maps, maybe even higher yellow tier maps, like 9 or 10, for trials to show up. Which tier you're currently running?

I didn't know they could only spawn from yellow maps and higher. That explains it. I'm completing all whites and doing some delve before goingo for yellow maps
About last league, I didn't farm lab. I farmed improved offerings. They just stopped coming in the last months of the league. I even tried removing and allocating back the notable related to improved offerings, to no effect.
Anyway, I'll start doing yellow maps, that should do the trick. Thanks!

Yes, that's what I meant, lab trials, not lab itself, sorry.

Since version 3.16 they don't spawn in white maps anymore. That's also the patch which removed the requirement to do lab trials to run the final lab.