Why do you need a variable-precision integration of this function starting frome "x"?
The error is because the marcumq function is a function from Signal Processing Toolbox that does not accept symbolic inputs. Instead, use the definition from the marcumq page (https://www.mathworks.com/help/signal/ref/marcumq.html ) to construct the function yourself using the symbolic exponential and bessel functions.
As you pointed out, "besseli" is available as a symbolic function and thus accepts the symbolic input "x".
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