What is the best statistical test for investigating if there is any correlation between 2 categorical variables?

Both are satisfaction scores:

1st variable is:

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> Overall satisfaction with the service.
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> 1: Not at all satisfied; 10: Completely satisfied
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2nd variable is:

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> Satisfaction with the availability of information for the service"
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> 1: Not at all satisfied; 10: Completely satisfied.
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