Installing the mentioned version of erlang gave me issues (I also tried with some other versions in 26.2…)

❯ asdf install erlang 26.2.1

ERROR: 'asdf_26.2.1' is not a kerl-managed Erlang/OTP installation.
Build 'asdf_26.2.1' has been deleted.
Extracting source code for normal build...
Building (normal) Erlang/OTP 26.2.1 (asdf_26.2.1); please wait...
Initializing (build) log file at /Users/justincalleja/.asdf/plugins/erlang/kerl-home/builds/asdf_26.2.1/otp_build_26.2.1.log.
Attempting to use Homebrew OpenSSL from /opt/homebrew/opt/openssl@3.0...
WARNING: ... you may have to brew the expected version or otherwise use --with-ssl
APPLICATIONS DISABLED (See: /Users/justincalleja/.asdf/plugins/erlang/kerl-home/builds/asdf_26.2.1/otp_build_26.2.1.log)
 * odbc           : ODBC library - link check failed

DOCUMENTATION INFORMATION (See: /Users/justincalleja/.asdf/plugins/erlang/kerl-home/builds/asdf_26.2.1/otp_build_26.2.1.log)
 * documentation  :
 *                  fop is missing.
 *                  Using fakefop to generate placeholder PDF files.

ERROR: build failed.
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/netinet/in.h:657:10: fatal error: cannot open file '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/netinet6/in6.h': Too many open files
  657 | #include <netinet6/in6.h>
      |          ^
1 error generated.
make[4]: *** [obj/aarch64-apple-darwin23.6.0/opt/jit/beam_asm_module.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [opt] Error 2
make[2]: *** [opt] Error 2
make[1]: *** [jit] Error 2
make: *** [emulator] Error 2

Please see /Users/justincalleja/.asdf/plugins/erlang/kerl-home/builds/asdf_26.2.1/otp_build_26.2.1.log for full details.
Auto cleaning all artifacts except the log file...
(use KERL_AUTOCLEAN=0 to keep build on failure, if desired)
Cleaning up compilation products for 'asdf_26.2.1' under:
  - /Users/justincalleja/.asdf/plugins/erlang/kerl-home/builds...
  - /Users/justincalleja/.asdf/downloads/erlang/26.2.1...
... done.

To overcome this, I had to:
ulimit -n 4096

to increase open file limits… might have helped but I also:
❯ brew install autoconf wxmac openssl@1.1 fop

with some issue with openssl@1.1

Anyway asdf list erlang lists it now and i could install the rest with asdf install and the tools version file.