The expression "ambiguous to" is correct and usable in written English.
It is used to express that something is not clear or obvious. For example, "His intention was ambiguous to me."
Exact(57)
Dr. Lee's reaction appeared ambiguous to investigators.
But the middle passages seem more ambiguous to me.
China's attitude to animals is ambiguous to say the least.
The clause is sufficiently ambiguous to leave doubts over how the stalemate will be resolved.
Most ambiguous, to me, is the new figure of the foodie.
Justice Scalia rejects this as too ambiguous to be a reliable restraint.
The kid didn't get it, but tennis authorities chose to decide that his remarks were too ambiguous to merit action.
It would be somewhat ambiguous to start charging for online news and still give away news in a free paper".
"What's been coming from the transportation secretary has been a little ambiguous, to say the least," he said.
But Mr Norgard's sixth is typically too complex and ambiguous to be stuffed into tight programmatic categories.
Carruth's lawyers seized on Adams's indecisiveness, calling the statements on the tape too tentative and ambiguous to be admissible at trial.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com