Max BR2-pro with Gigsky Simcards

I’m using https://www.peplink.com/products/max-br2-pro/ with a sim injector = https://www.peplink.com/products/sim-injector/
BR2 Pro is running F/W 8.2.1s200 build 5167.
The Sim injector has 8 Simcards installed. Simcards in slot 1-6 do not roam. Simcards in slot 7 and 8 are allowed to roam. Simcards in Slot 7 and 8 are from a provider named Gigsky.

Orginally the Gigsky simcards didn’t come online.
After communicating with Gigsky support, they proposed the following:

  1. Hardcode the Peplink modem to use slot 8
  2. Our SIM card uses multiple IMSIs and the messaging we see suggests that it’s on the wrong IMSI for data connectivity in Denmark. Our IMSI-switching technology either uses SMS to trigger a change or an applet built into the SIM. As the Peplink MAX BR2 Pro is an LTE/5G-only device, the SMS messaging won’t work, so the only way to switch is through the applet. To prevent random switching, the applet waits for five minutes before switching. The logs you sent suggest that the device is switching after around 4 minutes. Is there any way to extend the timer, as this 4-minute switch may be preventing the applet from switching to the correct IMSI?

Anyone here, that has been able to get Gigsky simcards to work with peplink equipment?
How do I troubleshoot when Simcards aren’t able to get online?
Anyone has any clue what I can do?