imap - OAuth 2 SASL string error -

i have generated following sasl string oauth 2:

user=designadmin@npmdesign.mygbiz.com^aauth=bearer ya29.ahes6zttyou0nr0vaybrvkznchjpuzepr4hk3w3dxcxfq88^a^a

then encoded , sent encoded string this:

msb authenticate xoauth2 encoded string

but error response as:

{"status":"400","schemes":"bearer","scope":"https://mail.google.com/"}

what error mean , how can correct it?

i figured out. in case, gmail scope("https://mail.google.com/") missing, token generation process. works fine now.

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