Something happened in the last 2 month probably a firmware update that broke Speed Test function.
Because we users do not have visibility into those settings my guess is that only Rogers network team can fix it.
Let me know if you need log info.
Router additional info:
Thank you all for being our Community members; thank you for flagging this issue with the built-in Speed Test function on your Nokia FastMile 5G Gateway 3.2. Has this been reported to tech support?
In the meantime, you can use other online speed test tools to check your internet performance. Thank you for your patience and understanding.