There can be a few issues for this. Initiate troubleshooting by checking on the following:
- Try using a different power plug, which you know works (i.e. which you normally use to charge your phone for instance)
- Make sure the adapter has been properly installed to the charger so that a strong connection is made. The picture below shows how a properly inserted adapter should look like:

3. Ensure that the charging end of the charger has been fully inserted into the front panel of the bag
If this does not resolve the issue you are facing, please get in touch with our team so we could assist you further.
This actually answered my downside, thanks!