Thanks for reaching out to the Community for support. I'm happy to tackle this error with you.
Let's check if you're having some browser issues by opening an incognito window (private browser). An incognito window doesn't have saved cache (cookies). This allows for clean browsing history, which should clear any browser errors you may have. I've included the steps to open an incognito browser below.
Microsoft Edge and Firefox:
Hold Ctrl + Shift + P to switch to Private Browsing.
Hold Ctrl + Shift + N to switch to an Incognito window.
Hold Command + Shift + N to enable Private browsing.
Once you're using an incognito browser, let's try canceling your subscription plan again. If it works for you, then I recommend clearing the cache from your browser to remove any corrupted data that's saved.
However, if you're continuing to receive the error message, I recommend contacting our customer service team. They have the tools available to review your account and cancel your subscription for you securely. I've included the steps below to contact support.
1. Select Help (?).
2. Hit Contact Us at the bottom of the page.
3. Choose the best way to connect with support (Callback, Chat, Etc.).
Please let me know if you have any questions or concerns. You can reach out to the Community any time you find you need a helping hand. Take care!