The word 'bestätigt' can be used (to my knowledge) as either a verb or an adjective.
I have heard it pronounced with the 'g' sounding like the 'ch' in 'ich', and I've also heard it pronounced with the 'g' sounding like a normal hard 'g' you'd expect at the beginning of a syllable. There are other words with this form, like beschädigt and beschäftigt, that also seem to follow the same pattern.
Since the infinitive is "bestätigen" (which has a hard g for sure), it feels weird that the g would change to that 'ch' sound when conjugating it for er/sie/es. So I'm tempted to believe this word actually has different pronunciation depending on whether it's used as an adjective or as a verb.
What is the actual truth of the matter? Is either form acceptable in either case? Is it pronounced differently depending on how it's used?