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gam user <User Email Address> delete token clientid <Client ID>
The first command creates a CSV with the Token Ids. The second command will delete the tokens.
gam redirect csv ./UserTokens.csv user <User Email Address> print tokens
gam csv UserTokens.csv gam user "~user" delete token clientid "~clientId"
gam all users delete token clientid <Client ID>
gam user <User Email Address> print tokens todrive
gam group <Group Email Address> print tokens todrive
gam ou_and_children_ns <Top Level OU> print tokens todrive
gam all users print tokens todrive