Hi @MarenW9 ,
I completely understand the necessity of being able to schedule your post ahead of time. It does appear that the error message is coming to us from Twitter, usually because you are hitting some kind of 3rd Party API Restriction. If none of the limits on that link are being hit, we can try disconnecting and then reconnecting your Twitter profile to see if that resolves the issue. I have gone ahead and passed this feedback along to our engineering team as well, and I will have them reach back out to you at the email address on file for your Constant Contact account if we have any updates regarding this.
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