Access point name is the name of your wifi network.
For my Pixma MG5420, I had to change the WPA version on the Tmobile gateway app (Network tab, select your wifi network, under WPA version, change to WPA/WPA2 from WPA2/WPA3). Then on the printer, go to Device Settings ->LAN settings, ->wireless lan setup, ->Other setup options, ->Standard setup,->select access point, → Directly enter the access point name, then manually enter your wifi network and the passcode. Voila! This is after a fruitless call to Tmobile tech support, which described the problem I had connecting to a printer problem, and transfer me to Cannon tech support, which never connected me to a live person, but instead directed me to their website, then hung up.
On my Pixma MG5420, I had to change the WPA version on the Tmobile gateway app (Network tab, select your wifi network, under WPA version, change to WPA/WPA2 from WPA2/WPA3). Then on the printer, go to Device Settings ->LAN settings, ->wireless lan setup, ->Other setup options, ->Standard setup,->select access point, → Directly enter the access point name, then manually enter your wifi network and the passcode. Voila! This is after a fruitless call to Tmobile tech support, which described the problem I had connecting to a printer problem, and transfer me to Cannon tech support, which never connected me to a live person, but instead directed me to their website, then hung up.
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