How can I tell my manager that I feel I’m being underpaid?

My current role has a 6month probation period. Not long now and I’d have my probation review.

In the initial application stage I made the mistake of not negotiating salary. I feel I’m being paid less in my industry and deserve more - as well as based on sites, such as glassdoor. How can I ask for a higher salary, how do I go about it?

Suggestions are highly appreciated.

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