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Band problem (Xiaomi Redmi Note 9 Pro). What's the problem?

Hello,
I have bought a Redmi Note 9 Pro, thinking everything would work smoothly. My error.
I looked here for the bands supported:
https://www.frequencycheck.com/carrier-compatibility/YQqJty/xiaomi-redmi-note-9-pro-global-dual-sim-td-lte-128gb-m2003j6b2g-xiaomi-curtana-b2/bell-wireless-canada
(for my workplace, bell)
https://www.frequencycheck.com/carrier-compatibility/MrBMCq0/xiaomi-redmi-note-9-pro-global-dual-sim-td-lte-128gb-m2003j6b2g-xiaomi-curtana-b2/videotron-canada
(for personnal use, Fizz).
Seems fine so I ordered the phone. Now both Sim cards are having a great signal, but there's no way I can make / receive calls.
I tried both sim one at one and they work flawlessly. I tried both sim on another old phone, working fine. it's only the combination of both in the cell that creates problem.
I tried playing with preferred network settings (LTE/WCDMA/GSM). I tried them all, same problem happen. Sometimes it works for just about 5 minutes for one of the two, then the network drops.
Thanks!

Answers

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