I really like this service but I've been down for about a week now with no resolution and no response to my support ticket after the initial response which was to say that the service is down and engineers are working on it. I find it difficult to believe that it takes a week to resolve a connection issue to twitter. I'm beginning to wonder if I am going to have to dispute charges to my credit card for this "service"?
Here is my take on this situation. Twitter made changes to their rules as a result of the 2016 election meddling by other countries. Other companies have been blocked from integrating with Twitters API as a result. It appears that RoundTeam has now been affected. This is due to people breaking the rules and using the service to spam Twitter with multiple accounts. It impacts those of us who were not using this service for that purpose. For example, I was using it to auto retweet a list of certain people. I suspect this issue is not going to get resolved unless the company can negotiate some favorable terms with Twitter. It is a complicated issue. My .02
On October 22nd, Twitter started enforcing new app-level rate limits, which include a maximum of 300 tweets and retweets per hour, to reduce spam. The rate limits apply to the entire app, not each user of the app. Since the Roundteam app likely retweets thousands of tweets per hour, it has exceeded the limit. The developer has to apply to Twitter for "elevated POST access" to exceed the new limit. This involves an application and review process, which could take weeks, and it's possible Roundteam's request will be denied, which will kill this service.
I have been waiting over four days for a reply to me ticket with no idea what was happening, so I thank you for the great but very disheartening explanation.