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If you're on Android the Marvel app is in the Google play store: https://play.google.com/store/apps/details?id=com.marvel.comics
I don't know about Apple, but I would think it would be in their app store as well.
Oh. I've just seen that they are on sale in Amazon US and Amazon ES but not in Amazon UK. I don't know what could happen if you check the Marvel App. Maybe you should try?
For those that are a bit confused about the Immortal X-Men (2022) #6 code, you can go to your Insider profile and there is a Reward History window where you can find the code.
The you go to the redeem page where you enter in the code.
The only way to read the comic is on your Android or Apple device.
https://play.google.com/store/apps/details?id=com.marvel.comics
If you want to read them digitally- I believe all of them are available through the marvel comic app.