Plug-In Adapter (2nd Gen) - testing voltage output

Hi, I bought my Plug-In Adapter (2nd Gen) back in October 2022 and have finally got around to getting it all wired up to the existing chime wiring but the doorbell (Video Doorbell 2) does not light up as the guides suggest and it does not appear to be doing anything. Is there a way to test if the Plug-In Adapter is faulty. With a multimeter set to Volts DC it does not read much more then a random amount of milivolts sporadically, I would have thought I should see with it being DC 24v a reading that matches that. To test my wiring I setup some (3 at first for 18v, then 4 to get 24v) 6v Lantern batteries in series and wired them up to the doorbell and it worked flawlessly. I have two entrances to my house and at the rear entrance I have a Nest Doorbell (battery) and tested my 6v Lantern battery setup on it and it worked with 2, 3 or 4 wired in series as well. I am hesitant on testing the Plug-In Adapter (2nd Gen) on it just yet to verify the adaptor works (Google requirements for adaptors are the same as Ring). Any help would be appreciated