Ye idk. Never had that issue in recent time. However I had a similar problem about 2 years ago where it somehow put me on wrong servers (Eus instead of Weu) per default and that caused incredible mm times. Ive fixed that by simply changing the code from "default" to "weu" just like server hopping but instead of going on wrong servers I went back to the right one.
No idea if thats even the problem for you as well but checking your data center / ping could exclude that option.
Hey culydylan.2020 and So_Mono_! I'm sorry to hear that you both have been having some trouble with matchmaking in Rainbow Six Siege. I would strongly suggest completing our connectivity guide for Siege in full, including port forwarding. Doing so will ensure that the connection between our online services and yours is completely optimized. This should ultimately help lessen the long wait times and resolve any other errors you may be noticing. However, if those steps do not help to make any improvements, please open a case at support.ubi.com. Our team would be glad to investigate this further with you!