I am unable to use Compass (v1.30.1) to connect to a Docker container running an instance of mongodb

I have a very simple docker container with mongodb on Windows10.
docker run --name mongoTest -d -p 27017:27018 mongo

Using Compass (v1.30.1) and the following connection string mongodb://localhost:27017

I receive the following error from Compass: connection <monitor> to 127.0.0.1:27017 closed

Any help appreciated to get this working and an explanation. Thanks in advance.