Keyword Analysis & Research: why does valorant say username must be unique

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why does valorant say username must be unique	0.37	0.9	8491	75	45
why	0.69	0.7	7315	33	3
does	1.72	0.8	5752	79	4
valorant	1.2	0.9	746	72	8
say	1.71	0.6	5900	8	3
username	1.77	0.2	6101	68	8
must	1.82	0.7	3128	95	4
be	0.68	0.2	3101	15	2
unique	0.17	0.5	7075	51	6

Keyword	CPC	PCC	Volume	Score
why does valorant say username must be unique	0.86	0.6	1358	55