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Developers frequently release patches to fix metadata handling.
Over time, a4ksubtitles builds a cache of previously matched IDs. If this cache becomes corrupted, the add-on may return a null value instead of the correct ID.
"a4kSubtitles IMDB ID not provided" typically occurs when the Kodi media player cannot find or pass the unique IMDb identification number of a video to the a4kSubtitles
Go to Settings > Media > Library and ensure that "Update library on startup" is enabled to keep your metadata current.