# Reference tag to MQTT Engine - Bad\_NotFound

**URL:** <https://forum.inductiveautomation.com/t/reference-tag-to-mqtt-engine-bad-notfound/103523>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [March 11, 2025, 4:40pm UTC](https://forum.inductiveautomation.com/t/reference-tag-to-mqtt-engine-bad-notfound/103523 "2025-03-11T16:40:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Herman\_Lundberg](https://avatars.discourse-cdn.com/v4/letter/h/df705f/32.png) [@Herman\_Lundberg](https://forum.inductiveautomation.com/u/Herman_Lundberg)\
**Post date:** [March 11, 2025, 4:40pm UTC](https://forum.inductiveautomation.com/t/reference-tag-to-mqtt-engine-bad-notfound/103523/1 "2025-03-11T16:40:04Z")

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Hi!

I have an MQTT Engine provider. In Perspective I can do bindings to tags inside this provider. But from my default tag-provider I cannot do reference tags, expression tags (using tag path to tags from the MQTT Engine provider). I have tried this in my local gateway and it works fine. Are there any settings in the MQTT Engine that could prevent bindings to tags in a different provider? Any ideas what could cause this? On the gateway where it's not working there are a lot of providers. Is there a maximum amount of providers that tags can look up?