There are three versions of BL being sold.
Standard
Standard + Season Pass (bundle)
Digital Deluxe Edition
The latter two editions include the NTTE exotic pulse rifle. The Standard version does not include NTTE. If you purchased the Standard edition that is why you didn't get NTTE after completing the campaign. If you purchased the Standard edition and then later purchased a season pass with Silver that will not count for earning NTTE, it had to be one of the two packages offered for sale on your platform's store to get it as a bonus.
English
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Oh, I see. Yeah, I bought the standard edition then the season pass with silver. That explains it. Thank you