Cannot add IFTTT integration into Hass

I got the error message" Unknown Error Occurred" like the image below:

please help!!!

Tell us what you have done to that point.

Thank for your response.

Configuration → Intergrations → ADD INTERGRATION ->“IFTTT” → submit and I got it

I just tried it and did not het that. Anything in your log?

Traceback (most recent call last):
File “/usr/local/lib/python3.8/site-packages/aiohttp/”, line 422, in _handle_request
resp = await self._request_handler(request)
File “/usr/local/lib/python3.8/site-packages/aiohttp/”, line 499, in _handle
resp = await handler(request)
File “/usr/local/lib/python3.8/site-packages/aiohttp/”, line 119, in impl
return await handler(request)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 56, in security_filter_middleware
return await handler(request)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 18, in request_context_middleware
return await handler(request)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 74, in ban_middleware
return await handler(request)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 135, in auth_middleware
return await handler(request)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 131, in handle
result = await result
File “/usr/src/homeassistant/homeassistant/components/config/”, line 155, in post
return await super().post(request, flow_id)
File “/usr/src/homeassistant/homeassistant/components/http/”, line 63, in wrapper
result = await method(view, request, *args, **kwargs)
File “/usr/src/homeassistant/homeassistant/helpers/”, line 109, in post
result = await self._flow_mgr.async_configure(flow_id, data)
File “/usr/src/homeassistant/homeassistant/”, line 199, in async_configure
result = await self._async_handle_step(flow, cur_step[“step_id”], user_input)
File “/usr/src/homeassistant/homeassistant/”, line 257, in _async_handle_step
result: FlowResult = await getattr(flow, method)(user_input)
File “/usr/src/homeassistant/homeassistant/helpers/”, line 159, in async_step_user
webhook_url = self.hass.components.webhook.async_generate_url(webhook_id)
File “/usr/src/homeassistant/homeassistant/components/webhook/”, line 60, in async_generate_url
get_url(hass, prefer_external=True, allow_cloud=False),
File “/usr/src/homeassistant/homeassistant/helpers/”, line 116, in get_url
raise NoURLAvailableError

Do you have external_url set?

Downgrade HASS’s version to 2021.1.1 and I added it successfully
Thank you for your support!