When i try to connect with my platform showing following message
Sorry, there’s been a problem
This app is only for accountants. Please get in touch with the author of the application you’re trying to approve.
Hey Sindhu 
First off, a warm welcome to our API forum! It’s fantastic to have you! 
Now, let’s dive into your issue…
This error message often shows up when you attempt to connect to a practice-enabled app using a regular FreeAgent company account. We’d expect users who interact with these apps to be on practice dashboard accounts. If you have a practice dashboard account, please ensure you’re using those credentials.
Let me know how that goes when you give it a try. If you need anything else, I’m here and happy to help! 
Have a great rest of your day!
Fiona