Welcome to the community and Happy New Year!
Since you purchased the phone via Amazon, do you know which version of the phone you received? Have you verified that it has compatible bands/frequencies for the networks? You can verify the compatible bands/frequencies here.
When you say it works with other operators, are you referring to other Canadian operators?
@Mikefaus wrote:..it keeps crashing after I put the simcard in....
What do you mean by it keeps crashing? Does the device shut off or stall? Do you get error messages? Are you able to otherwise use the phone except for calling/messaging/data?
Hope this helps 😀