Log in to the spine switches if you have access and check that MetalLB is peering to the spines via BGP.
Check both spines if they are available (powered up):
show ip bgp summary
Example working state:
All the neighbors should be in the Established state.
sw-spine01 [standalone: master] # show ip bgp summary
VRF name : default
BGP router identifier : 10.252.0.1
local AS number : 65533
BGP table version : 6
Main routing table version: 6
IPV4 Prefixes : 84
IPV6 Prefixes : 0
L2VPN EVPN Prefixes : 0
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Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
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10.252.0.4 4 65533 465 501 6 0 0 0:03:37:43 ESTABLISHED/28
10.252.0.5 4 65533 463 501 6 0 0 0:03:36:51 ESTABLISHED/28
10.252.0.6 4 65533 463 500 6 0 0 0:03:36:39 ESTABLISHED/28
If the State/pfxrcd is “IDLE” you need to restart the BGP process with the following command:
sw-spine01 [standalone: master] # clear ip bgp all