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Not being able to self-serve the flex channels swapping can be inconvenient. What happens when you try swapping flex channels? Do you get any error messages?
When you log in to your MyRogers, do you see Ignite TV service?
You can try signing into MyRogers online at rogers.com/myrogers and Unlink/Link your account. From the Settings/Linked Accounts menu, document your account number and Unlink the account. Link your account back and see if you can swap your flex channels.