Cant help directly but is it a new printer first connection or one that was working fine before getting the Mesh?
The Canon fora are full of threads from people struggling to get that model of printer to connect to wifi - for apparently different issues
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.