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Hello, the igniters have a 2 to 5 year life span, if it is older than that the odds are good that its bad, regardless of the apparently good tests.
It is also possible the you read 27v on the female side of the igniter plug but that there are bad pin connections so that the igniter itself is not getting the 27volts
Do not touch the igniter element but remove it and tell me what voltage rating is stamped on the side.
We can go from there.