azure cosmosdb - vercel cosmoDB issue

Question

Using cosmoDB getting this error on vercel:

{
    "errorType":"Runtime.UnhandledPromiseRejection",
    "errorMessage":"MongoError: Cannot create unique index when collection contains documents",
    "reason":{
        "errorType":"MongoError",
        "errorMessage":"Cannot create unique index when collection contains documents",
        "code":67,
        "ok":0,
        "codeName":"CannotCreateIndex",
        "name":"MongoError",
        "stack":[
            "MongoError: Cannot create unique index when collection contains documents"
            {
                "errorType":"Runtime.UnhandledPromiseRejection",
                "errorMessage":"MongoError: Cannot create unique index when collection contains documents",
                "reason":{
                    "errorType":"MongoError",
                    "errorMessage":"Cannot create unique index when collection contains documents",
                    "code":67,
                    "ok":0,
                    "codeName":"CannotCreateIndex",
                    "name":"MongoError",
                    "stack":["MongoError: Cannot create unique index when collection contains documents"

while logging into vercel site user already exists.

Answer 1

等待大神答复