checkoutCompleteWithTokenizedPaymentV3 - Email is invalid

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Hello. I use mutation checkoutCompleteWithTokenizedPaymentV3 to complete the checkout through API and Stripe as a payment provider and getting error as a result of POST request:

"data": {
"checkoutCompleteWithTokenizedPaymentV3": {
"checkout": {
"id": "Z2lkOi8vc2hvcGlmeS9DaGVja291dC9kYzQ1YTNlZmVlN2E5YzE2YjkyZDA3MGU4OTg0NWM3ND9rZXk9MjA0Y2E1MmQ3NmU3ZmVlYzZlZmJkZjY5MmNlNzk5MDE="
"checkoutUserErrors": [
"code": "INVALID",
"field": null,
"message": "Email is invalid"
"payment": null

I didn't find information about this type of error in the doc, please help to resolve this issue for us.