I had the same problem! The 'Bring My Label' option when requesting a collection is only available if I request the collection when purchasing the postage. This option is not available when I request for collection AFTER purchasing the postage. I think this should be amended such that customers are able to request for 'Bring a label' when collecting irrespective of the timing of this request. If there is a reason for this arrangement, I also think the app should state that 'Bring a Label' is only available for selection during purchasing of postage.
I had the same problem! The 'Bring My Label' option when requesting a collection is only available if I request the collection when purchasing the postage. This option is not available when I request for collection AFTER purchasing the postage. I think this should be amended such that customers are able to request for 'Bring a label' when collecting irrespective of the timing of this request. If there is a reason for this arrangement, I also think the app should state that 'Bring a Label' is only available for selection during purchasing of postage.