When I use Salesforce activity I am unable to connect:
Error: Invalid connection (Invalid grant & authentication failure)
I have same issue,
I don’t know if you had a solution?
Thank you very much
Are you still facing that problem?
The most known issue for this problem is changing the password without Changing the Secret Token. Every time you change the password you need to update the token again and get the email, and please follow all the steps from this video:
If you don’t use a security token please be sure that you have your IP on the Trusted List like in this movie: