# Check if the authenticate() in the SignIn page contains the middle page main net link as the base URL

    const baseUrl = 'https://ckjzv-zyaaa-aaaag-qc6rq-cai.icp0.io';

# The HttpAgent in the initUniLinks() of SignIn page should have the following host in HttpAgentOptions()

    HttpAgent newAgent = HttpAgent(
       options: HttpAgentOptions(
         identity: _delegationIdentity,
         host: 'icp-api.io',
       ),
     );

# The CanisterActor in the initUniLinks() of SignIn page should have the following canisterId in ActorConfig()

    newActor = CanisterActor(
         ActorConfig(
           canisterId: Principal.fromText('c7oiy-yqaaa-aaaag-qc6sa-cai'),
           agent: newAgent,
         ),
         FieldsMethod.idl);       

# Update the HttpAgent() as follows:

    HttpAgent newAgent = HttpAgent(
       options: HttpAgentOptions(
         identity: _delegationIdentity,
       ),
       defaultHost: 'localhost',
       defaultPort: 4943,
       defaultProtocol: 'http',
     );

# Update the canisterActor() as follows:
# Here the canisterId should be your local backend canister ID.

    newActor = CanisterActor(
         ActorConfig(
           canisterId: Principal.fromText('c7oiy-yqaaa-aaaag-qc6sa-cai'),
           agent: newAgent,
         ),
         FieldsMethod.idl);

# Update the baseURL in the authenticate() function:
# The canisterId should be the middle page canisterId.

    const baseUrl = 'http://localhost:4943';
       final url =
        '$baseUrl?sessionkey=$publicKeyString&canisterId=bd3sg-teaaa-aaaaa-qaaba-cai';