Creating Document with Relationship resulting error The current user is not authorized to perform

I have user collection having user details
like
Table user {
user_id integer
name string
profession string
user_qualification ( relationship with user_qualification )
}

I have a qualification collection
Table qualification{
qualification_id integer
qualification_name string
}

and I have user_qualification table

Table user_qualification{
user_id integer (two way relationship with user collection)
qualification_id integer ( one way relationship with collection)
}

Now I want to allow user to self assign them qualification

so I am having this createDocument call

const addUserQualification = async (req) => {
    try{
      const userStore = useUserStore()
      return await databases.createDocument(
          appwriteConfig.databaseId,
          appwriteConfig.userQualificationsCollectionId,
          ID.unique(),
          {
            user: userStore.user,
            qualification: req
          }
      )
    }catch (e){
      throw e
    }
}

I am using pinia store, and userStore.user return full user object and req is qualification object.
But though user have permission to create and update document

AppwriteException: The current user is not authorized to perform the requested action