Hi @james_riach ,
Could you please share a bit more about the 'LFF UK IT Task List' data source? Is it a SP List?
Based on the screenshot that you mentioned, I think this issue is related to the 'Sub Theme' field (Choice type field) in your SP List data source.
Currently, the Choice type field is not delegable within Sort function. Please check the following article for more details:
If you want to get rid of the Delegation warning issue within your formula, I afraid that there is no direct way to achieve your needs in PowerApps currently.
As an alternative solution, you could consider create a Calculated field for each Choice type field in your 'LFF UK IT Task List' SP List. Set the Formula box for each Calculated field to following:
Then within your formula, please use the Calculated field as Sort column within your Sort formula intead of the original Choice type fields, then check if the issue is solved.
Also please check and see if the alternative solution I provided within the following thread would help in your scenario:
Please consider take a try with the following workaround, check if the issue is solved.
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Features releasing from October 2020 through March 2021