# Error validating call.com tools **URL:** \ **Category:** Support Help\ **Created:** [January 10, 2026, 9:52pm UTC](https://community.retellai.com/t/error-validating-call-com-tools/394 "2026-01-10T21:52:06Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Vmx\_solutions](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/vmx_solutions/32/360_2.png) [@Vmx\_solutions](https://community.retellai.com/u/Vmx_solutions)\ **Post date:** [January 10, 2026, 9:52pm UTC](https://community.retellai.com/t/error-validating-call-com-tools/394/1 "2026-01-10T21:52:06Z")
Hello together, everytime i try to connect retell ai with the api key from [cal.com](http://cal.com) i get this error: **error validating [call.com](http://call.com) tools** i am trying to solve it but there is no chance for me… Can somone help me please? Thank you, Marvin ---
**Author:** ![support2](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/support2/32/15_2.png) [@support2](https://community.retellai.com/u/support2)\ **Post date:** [January 10, 2026, 9:52pm UTC](https://community.retellai.com/t/error-validating-call-com-tools/394/2 "2026-01-10T21:52:28Z")
Based on the sources, this “error validating [cal.com](http://cal.com) tools” issue has been reported by multiple users and appears to have specific causes[(1)](https://discord.com/channels/1186424376300679209/1432750783580999862). **Common solutions to try:** 1. **Rotate your [Cal.com](http://Cal.com) API key** - Generate a new API key in your [Cal.com](http://Cal.com) dashboard under Settings \> Developer \> API Keys, then update it in Retell[(2)](https://docs.retellai.com/build/book-calendar)[(3)](https://discord.com/channels/1186424376300679209/1432628757067337778). 2. **Verify your Event Type ID** - Ensure the event type ID you’re using actually exists in [Cal.com](http://Cal.com). You can find it in the URL when viewing your event type (e.g., `https://app.cal.com/your-username/event-type/1427703` where `1427703` is the ID)[(2)](https://docs.retellai.com/build/book-calendar)[(4)](https://docs.retellai.com/build/check-availability). 3. **Check for Round Robin events** - There have been reported issues specifically with Round Robin team calendars. If you’re using a Round Robin event, try switching to a normal (single-user) event type temporarily to see if that resolves the validation error[(1)](https://discord.com/channels/1186424376300679209/1432750783580999862). 4. **Confirm API key hasn’t expired** - Make sure your [Cal.com](http://Cal.com) API key is still valid and hasn’t been revoked[(1)](https://discord.com/channels/1186424376300679209/1432750783580999862). **Setup requirements:** When adding the [Cal.com](http://Cal.com) integration in Retell, you need to provide[(2)](https://docs.retellai.com/build/book-calendar)[(4)](https://docs.retellai.com/build/check-availability): - Tool name (must be unique within that agent) - API Key from [Cal.com](http://Cal.com) - Event Type ID - Tool description - (Optional) timezone If none of these solutions work, the issue may be related to a broader [Cal.com](http://Cal.com) integration problem that was reported in late October 2025, which has since been marked as fixed[(1)](https://discord.com/channels/1186424376300679209/1432750783580999862). ---
**Author:** ![Yelawolf](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/yelawolf/32/585_2.png) [@Yelawolf](https://community.retellai.com/u/Yelawolf)\ **Post date:** [January 29, 2026, 6:06pm UTC](https://community.retellai.com/t/error-validating-call-com-tools/394/3 "2026-01-29T18:06:57Z")
Couldnt solve i have the same error ---
**Author:** ![Omar\_Ashraf](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/omar_ashraf/32/102_2.png) [@Omar\_Ashraf](https://community.retellai.com/u/Omar_Ashraf)\ **Post date:** [January 29, 2026, 6:48pm UTC](https://community.retellai.com/t/error-validating-call-com-tools/394/4 "2026-01-29T18:48:42Z")
Hello @Yelawolf Can you share your agent id?