You don’t. You’ll need to have a Kabam ID (email as username, and password, thru Kabam, not thru Google/Apple) and somehow successfully get it to be linked to your Game Account.
(without the process accidentally making a brand new account for that, although your Google Play Center logged in account will still be there too)
Can try the Help Articles below, or Submit a Request to support (links within articles below) to help do that for you,
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You’ll need to have a Kabam ID (email as username, and password, thru Kabam, not thru Google/Apple) and somehow successfully get it to be linked to your Game Account.
(without the process accidentally making a brand new account for that, although your Google Play Center logged in account will still be there too)
Can try the Help Articles below, or Submit a Request to support (links within articles below) to help do that for you,
https://help.kabamsupport.com/hc/en-us/sections/360011164011-Account-Issues