Issue while Importing RestApi Id

I am creating API gateway using the first template, and exported the same RestApi Id which i want to use in second template.

first template

AWSTemplateFormatVersion: 2010-09-09
Transform: 'AWS::Serverless-2016-10-31'
Description: An AWS Serverless Application.
Resources:
  AdminApi:
    Type: 'AWS::Serverless::Api'
    Properties:
      StageName: Dev
      Auth:
        AddDefaultAuthorizerToCorsPreflight: false
        DefaultAuthorizer: MyCognitoAuthorizer
        Authorizers:
          MyCognitoAuthorizer:
            UserPoolArn: >-
              arn:aws:cognito-idp:us-east-1:278556492334:userpool/us-east-1_H3XrefWaA
            Identity:
              Header: Authorization
      Cors:
        AllowMethods: '''GET,POST,OPTIONS'''
        AllowHeaders: '''Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'''
        AllowOrigin: '''http://localhost:3000'''
  UserFunction:
    Type: 'AWS::Serverless::Function'
    Properties:
      Architectures:
        - x86_64
      Handler: 'User::User.LambdaEntryPoint::FunctionHandlerAsync'
      Role: null
      Policies:
        - AWSLambdaBasicExecutionRole
      Events:
        GetUser:
          Type: Api
          Properties:
            Path: '/Users'
            Method: GET
            RestApiId: !Ref AdminApi
            Auth:
              Authorizer: MyCognitoAuthorizer
              AuthorizationScopes:
                - aws.cognito.signin.user.admin
        AddUser:
          Type: Api
          Properties:
            Path: '/User'
            Method: POST
            RestApiId: !Ref AdminApi
            Auth:
              Authorizer: MyCognitoAuthorizer
              AuthorizationScopes:
                - aws.cognito.signin.user.admin
 
Globals:
  Function:
    Runtime: dotnet6
    CodeUri: ''
    MemorySize: 256
    Timeout: 30
Outputs:
  AdminApiRestApiId:
    Description: AdminAPI gateway
    Value: !Ref AdminApi
    Export:
      Name: AdminApiRestApiId

In this template I am trying to Import RestApi id that we created and exported in first template but i am facing a error " Invalid Serverless Application Specification document. Number of errors found: 1. Resource with id [TermsAndConditionFunction] is invalid. Event with id [GetTermsAndConditions] is invalid. Property 'RestApiId' should be a string. Failed to publish AWS Serverless application "

Here is the second template

AWSTemplateFormatVersion: 2010-09-09
Transform: 'AWS::Serverless-2016-10-31'
Description: An AWS Serverless Application.

Resources:
  TermsAndConditionFunction:
    Type: 'AWS::Serverless::Function'
    Properties:
      Architectures:
        - x86_64
      Handler: 'TermsAndConditions::TermsAndConditions.LambdaEntryPoint::FunctionHandlerAsync'
      Role: null
      Policies:
        - AWSLambdaBasicExecutionRole
      Events:
        GetTermsAndConditions:
          Type: Api
          Properties:
            Path: '/TermsAndConditions'
            Method: GET
            RestApiId: !ImportValue AdminApiRestApiId
            Auth:
              Authorizer: MyCognitoAuthorizer
              AuthorizationScopes:
                - aws.cognito.signin.user.admin
        AddTermsAndCondition:
          Type: Api
          Properties:
            Path: '/TermsAndConditions'
            Method: POST
            RestApiId: !ImportValue AdminApiRestApiId
            Auth:
              Authorizer: MyCognitoAuthorizer
              AuthorizationScopes:
                - aws.cognito.signin.user.admin
 
Globals:
  Function:
    Runtime: dotnet6
    CodeUri: ''
    MemorySize: 256
    Timeout: 30
Outputs: {}

Any suggestions or Solution would be appreciated. Thanks in advance..!