How many teams can I make under the Enterprise plan? Is it limited?
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https://community.miro.com/miro-for-work-48/teams-on-the-enterprise-plan-5888
https://help.miro.com/hc/en-us/articles/360017730433-Enterprise-plan
https://help.miro.com/hc/en-us/articles/360017730233-Plans-and-features-available
Therefore I would say it's safe to assume they are unlimited.
However, if you require an official answer, and not one from a volunteer forum moderator, do feel free to send your question to the Miro support team 
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