Anybody able to have internet connection in Canada under the Magenta 55+ plan?

Make sure roaming and data roaming are enabled on your device.  Instead of automatically connecting, i would personally recommend manually selecting the network Bell 4G.  Telus 4G will also work but Bell seems to have the more reliable connection even though they are essentially the same company.  If you have exceeded your 5GB of roaming data for your billing cycle, you will still have data but it will be so slow, it might seem like it is't working.  If none of that works, including manually adding the APN for Bell or Telus as suggested above.  Try completely powering your device off for at least 5 minutes to allow the device to drop off of the network and refresh it's connection when you power it back on.