SIM Activation issue, is this a known issue?

You need to check all of these :

• Did you check the compatibility of your cellphone with the LTE Network?
You can check it on various websites, just type <phonename> LTE and you'll have short results saying that it is or not compatible with LTE.
• Did you turned on data while plugging in the card SIM? It is important to do so, because it'll help your phone to set the network settings.
• If all of that done and still not working, you should modify the APN settings as shown in this article
https://fizz.ca/en/faq/what-are-fizz-network-parameters-apn

If none of this work, ask the Fizz messenger on their facebook to look into your problem, I had the same problem and they solved it within days.