Updates a LinkedIn campaign group (only the provided fields change). status: ACTIVE | PAUSED | DRAFT | ARCHIVED. Budget changes are subject to the safety cap (increases above +50% are blocked). start_date / end_date ('YYYY-MM-DD') change the run schedule; the side you leave empty is kept. objective_type tries to change the group's objective. Read this before using it: an objective set at GROUP level constrains every campaign inside the group, so a group created with ENGAGEMENT cannot host a Lead Generation ad set. LinkedIn normally refuses to change it once the group exists — the attempt is passed through and its real answer is returned, so you find out instead of guessing. If it is refused, the remedy is a new group with the objective left EMPTY (that is the default, and it keeps the group open to every objective). confirm=false = preview.