Dataflow timeouts in Power Apps can be caused by issues with the queries in your dataflow. One common error is the "502 - Web server received an invalid response while acting as a gateway or proxy server." To fix this, you need to ensure that key fields are defined on your tables and create indexes on the tables generated by the queries. Focus on the queries that give you your results or the ones used by later queries. These timeout issues can be resolved by optimizing the query architecture in your dataflows.
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