Please try the following and let us know the result:
Make sure you remove the plastic tab from underneath the slider switch.
Make sure there is no obstruction between the slider switch metal contacts. Clean off any debris if necessary.
While laying the module flat on a surface, press down on the slider switch (the metal piece) and gently rock it back and forth. This will also help to remove any debris from between the metal contacts of the slider switch.
Wiggle each battery. If that doesn’t work remove and reinstall the batteries. It’s ok to pry off the hot glue if necessary. Sometimes there’s debris under the batteries so removing and reinstalling will help to remove it.
If your module has a “chip” remove the chip and reinsert it.
If your module has a light sensor or push button that plugs into the module, please make sure it is plugged in all the way.
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