I’ve been testing Calendly for the past two days and was actually planning to upgrade to a paid plan after the trial – mainly for the Google Ads integration. Everything is already set up and successfully connected to Microsoft Exchange.

My first test yesterday worked perfectly. So I replaced Microsoft Bookings and made Calendly fully live on our website, which is currently receiving around 300 clicks per day from a running ad campaign.

Today, however, I’m getting an error page every time someone tries to complete a booking – right at the final step, after clicking the "Schedule Event" button. This happens both inside the embedded iFrame on our website and via the direct Calendly link, regardless of the browser.

To rule out configuration issues, I even created a second test event with default settings, completely basic – and the exact same error still appears at the booking confirmation step.

Is Calendly really that unstable?
Since I’m still on the free trial, I can’t find any phone number, email address, or even a functioning support chat. Now looking here on Facebook, I see that many others are also experiencing serious problems.

This is extremely frustrating. I’m now seriously considering throwing away 1.5 days of work and switching to a different booking tool altogether.

I would really appreciate a quick and clear response.

Thanks.