I recently submitted an "Enter the Nether" RSG run. I can not think of any reason why it was declined. 
Here is the run: https://www.youtube.com/watch?v=8H6uNcb1484

it shows the reason why it got rejected below, its probably because you didnt put a seed in the description

Why was this run declined?

Khalooody

Yoopicul

Vedertesu

12stoutstreet

Mattgwat

Smemzy

StarSpeed

Minecraft: Java Edition Category Extensions

7rowl

FoughtCash92

itvxz

Voxaan

Diamond

Cake

Golden Apple

Emerald

Structures

No Structures

Wither

Elder Guardian

All Bosses

Set Seed Glitchless

Random Seed Glitchless

1.10

1.11

1.12

1.13

1.14 Easy

Normal

Hard

Hardcore

1.8.9

1.12.2

1.14.2

1.7.2

1.14.4

1.14.3

1.13.2

1.5.2

1.8.8 No F3

1.7.9

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.7.10

1.3.1

1.3.2

1.4.2

1.4.4

1.4.5

1.4.6

1.4.7

1.5.1

1.6.1

1.6.2

1.6.4

1.7.4

1.7.5

1.7.6

1.7.7

1.7.8

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

1.9.1

1.9.2

1.9.3

1.9.4

1.10.1

1.10.2 Item

Structures (Obtain Item)

Boss

SS/RS/SSG/RSG (Kill Bosses)

SSG/RSG (Enter Nether)

SSG/RSG (All Swords)

SSG/RSG (All Woods)

SSG/RSG (All Wool)

SSG/RSG (Full Iron 15 Levels)

SS/RS/SSG/RSG (HDWGH)

Version

Difficulty

Sub Version

Structures (Enter Nether)

Structures (All Swords)

Structures (Full Iron 15 Levels)

SSG/RSG (All Minerals)

Structures (All Minerals)

Version (All Bosses)

Mods

SSG/RSG (Hero of the Village)

SSG/RSG (All Workstations)

SSG/RSG (Full Inventory)

Structures (Full Inventory)

Version (All Swords)

Version (All Minerals)

Version (All Wood Logs)

SS/SSG (Enter End)

SSG/RSG (Arbalistic)

Item (Glitched)

SS/RS (Enter Nether (Glitched))

SS/RS (All Wool (Glitched))

SS/RS (Full Iron + 15 Levels (Glitched))

Structures (Full Iron Armor + 15 Levels (Glitched))

SSG/RSG (Obtain Item)

SS/RS (All Swords (Glitched))

Structures (Arbalistic)

SSG/RSG (All Versions)

Version Range

Difficulty (All Versions)

SSG/RSG (Sonic, Tails, and Knuckles)

SSG/RSG (20w14∞)

SS/SSG/RS/RSG (Mine a Chunk)

Dimension (Mine a Chunk)

SS/SSG/RS/RSG (Stack of Lime Wool)

SS/SSG/RS/RSG (All Portals)

Version (Filtered Seed Glitchless)

Player Count (Mine a Chunk)

Subcategory (15w14a)

SS/SSG/RS/RSG (15w14a)

Version (Half%)

SS/SSG/RS/RSG (Half%)

Player Count (Filtered Seed Glitchless)

Version (All Wool)

/seed (SRG)

SSG/RSG (Pride%)

RSG/SSG/RS/SS High%

Version (HDWGH)

Version (All Portals)

SSG/RSG (Cover Me in Debris)

Structures (Cover Me in Debris)

Version (Enter Nether)

Version (Mine a Chunk)

## The rules have been officially reorganised - nothing has changed.

The rules for the Minecraft: Java Edition leaderboards have officially been rewritten and updated. The goal of rewriting the rules was to create one, definitive place wherein all MCSR rules are stored, completely eliminating any a

Official Rewritten Rules

1.21.4+ All Wood Logs

Updated requirements for Category Extensions

Minecraft

Please request new categories in #category-submissions on the discord

Rules Update (Providing Seed)

Poll: Allow Dungeons And Nether Fortresses (1.0-1.7.10) in categories with No Generated Structures.